Vernal Equinox–0h RA, 0* Dec
Autumnal equinox–12h RA, 0* Dec
Zenith for 50* Lat–90* altitude, 0* azimuth or any other you wish, as it has no meaning for zenith.
North Celestial Pole altitude for 50* Lat–50*, Azimuth–0*
The only RA and Dec for the vernal equinox is 0h and 0 degrees.
The only RA and Dec for the autumnal equinox is 12h and 0 degrees.
The altitude of everybody’s zenith is 90 degrees, and the azimuth of anybody’s zenith is undefined.
The equinoxes are at the same RA and Dec for everybody.
Vernal Equinox–0h RA, 0* Dec
Autumnal equinox–12h RA, 0* Dec
Zenith for 50* Lat–90* altitude, 0* azimuth or any other you wish, as it has no meaning for zenith.
North Celestial Pole altitude for 50* Lat–50*, Azimuth–0*
use the definitions for all of these.
The only RA and Dec for the vernal equinox is 0h and 0 degrees.
The only RA and Dec for the autumnal equinox is 12h and 0 degrees.
The altitude of everybody’s zenith is 90 degrees, and the azimuth of anybody’s zenith is undefined.